7-11 September 2015
Warsaw, Poland
Europe/Zurich timezone

Liberating vector fields from their CMB anisotropy constraint

9 Sep 2015, 11:10
Rm 111+112 ()

Rm 111+112


Juan Carlos Bueno Sanchez (Universidad Antonio Narino, Colombia)


The contribution of cosmological vector fields to the CMB is strongly constrained by the bound on the anisotropy parameter g, allowing a direction-dependent contribution only to a puny 0.2% level, thus establishing the global isotropy of the CMB to high precission. In this talk I present a scenario whereby a vector field, produced during inflation and free from ghost and perturbative instabilities, avoids this anisotropy constraint by imposing an observable direction-dependent perturbation on relatively small patches of the CMB only. I describe the scale-dependent statistical distribution of the curvature pertubation contributed by the vector field and discuss the naturalness of the setting and its implications.

Presentation Materials